Multiple-exposure attachment for cameras.



PATENTED NOV. 1, 19041 H'. L. BOSTON. MULTIPLE EXPOSURE ATTACHMENT FORCAMERAS.

APPLICATION FILED JUNE 4. 1904.

entor I, Eg

Witnesses Fickornegs No. 773,627; PATENTED NOV. 1, 1904. H. L. BOSTON.

MULTIPLE EXPOSURE ATTACHMENT FOR CAMERAS. APPLIO M1011 FILED JUNE 4,1904.

2 SHEETS-SHEET 2.

N0 MODEL.

\ Nitnesses llfio j i aiz flnventor.

" Httomegs N1TED STATES fatentecl i\SOVe111D61' 1, .Lvua.

PATENT FFIQE.

HARVEY L. BOSTON, OF DAVID CITY, NEBRASKA.

MULTIPLE-EXPOSURE ATTACHMENT FOR CAMERAS.

SPECIFICATION forming part of Letters Patent No. 773,627, dated November1, 1904.

Application filed Jnne 4, 1904. Serial No. 211,190. (No model.)

To all whom it puny concern:

Be it known that I, HARVEY L. BOSTON, a citizen of the United States,residing at David City, in the county of Butler and State of Nebraska,have invented a new and useful Multiple-Exposure Attachment for Cameras,of which the following is a specification.

This invention relates to cameras, and has for its object to provide animproved platecarrying attachment capable of adjustment across theexposure-opening of the camera, so as to obtain a plurality of exposuresupon a single sensitive plate. It is furthermore designed to provide forconveniently adjusting the attachment in directions at right angles toone another at regular intervals to insure an accurate shifting of thedevice and prevent overlapped exposures, thereby to effectually make useof the entire plate Without losing any portion thereof.

Another object of the invention is to pro.- vide for adjusting theexposure-opening of the attachment so as to vary the size and shapethereof according to the number and shape of the exposures to bereceived by the plate.

A further object of the invention is to have all the parts of theattachment arranged for convenient access in adjusting the same and toinsure the exclusion of light through the joints of the several parts ofthe device in a simple and effective manner without interfering with theready disconnection ofany of the parts whenever desired.

With these and other objects in view the present invention consists inthe combination and arrangement of parts, as will be hereinafter morefully described, shown in the accompanying drawings, and particularlypointed out in the appended claims, it being understood that changes inthe form, proportion, size, and minor details may be made Within thescope of the claims without departing from the spirit or sacrificing anyof the advantages of the invention. V V

In the drawings, Figure 1 is an elevation of amultiple-exposureattachment embodying the features of the present invention.

Fig. 2 is a similar view with the plate-holder support removed. Fig. 3is a longitudinal sectional view taken on the line 3 8 of Fig. 1. Fig. 4is a detail sectional view taken on the line 1 4 of Fig. 3, showingportions of the back and the main carrier only. Fig. 5 is an enlargeddetail sectional view on the line 5 5 of Fig. 1. H

- Like characters of reference designate corresponding parts in each andevery figure of the drawings. 7

The present attachment includes a body made up of outer and innermembers 1 and 2 in the form of rectangular plates, which are providedwith centrally-registered rectangular openings 3 and 4, respectively. ofa size at least equal to that of the largest sensitive plate which thecamera is capable of receiving. These two plates or members are placedface to face and are connected by means of a peripheral flange 5,carried by the inner side of the outer member and fitting within acorresponding groove or seat 6 in the adjacent inner face of the innermember 2, thereby effectually excluding light from entrance between thetwo members. A peripheral groove or seat 7 extends around the edge ofthe member 2 upon the outer face thereof, so as to receive acorresponding flange upon the back of the camera-box to insure a snuglit of the attachment and to'ex'clude light from between the latter andthe back of the camera-box. Upon the top edge of the peripheral flange 5is a catch 8, adapted to engage a hook upon the top of the camera-box,so as to connect the attachment to the box against accidental separationtherefrom.

Mounted to slide horizontally across the outer or rear face of the platemember 1 is a carrier-plate 9, which is provided at its center with arectangular opening 10, corresponding in size to the openings in thebody members 1 and 2, and extending around the edge of the opening 10 atthe outer sidethereof is a peripheral flange 11. Near the uprightopposite edges of the carrier 9 are parallel upright guideways, eachconsisting of a strip or rib 12, secured to the outer face of thecarrier with a metallic strip or plate 13, secured to the outer face ofthe rib and projected at the inner edge thereof, so as to overlap thecarrier and form an open-ended groove or way. At their top edges thecarrier and the body of the attachment are slidably connected by meansof a keeper in the nature of a flanged metal strip 14, secured to thetop edge of the plate member 1, with its opposite pendent flangesembracing the carrier and the body so as to permit of the 'forl'nerbeing slid edgewise in a horizontal direction upon the body. The bottomsof the members 1 and 2 are connected by a plate ii to ex elude lightfrom the interior of the hollow back formed by said members, the frontportion of the plate being projected in advanceof the back member 1 andprovided with an upstanding flange 1a", loosely received within thelongitudinal groove in the lower edge of the main carrier 9, so as toform a guideway for the lower edge thereof. Carried by one of theupright edges of the carrier, preferably near the upper right-handcorner thereof, is a catch 15 in the nature of a spring-actuated boltworking transversely across the edge of the carrier toward and away fromthe member 2 of the body, the latter having a keeperplate 16 upon theouter face thereof and pro vided with parallel horizontal sets ofperforations or sockets 17, into which the springbolt is designed tosnap, so as to hold the carrier 9 at any adjusted position upon thebody. It will be noted that the sockets of one set are disposed atintervals differing from those of the other sets,'and the catch isadjust able vertically upon the carrier, so as to coopcrate with any ofthe sets of sockets, whereby the carrier may be locked at a plurality ofpredetermined positions. It will of course be understood that therelative positions of the sockets 17 have been accurately determined inorder that the carrier may be held accurately with respect to theexposure-opening of the camera, as will hereinafter appear.

A vertically-zuljustable substantially rectangular frame 18 is mountedto slide in the guideway formed by the bars 12 and flanges 13 and iscapable of being supported at different elevations through the medium ofa spring-catch 19, secured to the right-hand corner of the frame andcoi'merating with a keeper-plate 20, having several verticallydisposedsets of sockets or perforations 21. The catch is of course adjustablehorizontally upon the frame, so as to cooperate with any of the sets ofsockets, and the members of each set of sockets are disposed atintervals differing from those of each of the other sets. thereby toobtain a plurality of adjustments for the frame. This frame 1S providedwith a central rectangular opening 22 of considerably greater area thanthe opening 10 of the carrier-plate 9, the edge of said opening beingrabbeted at its outer side, as indicated at 23, with an upstanding ribor flange 21: extending horizontally across the outer side j of thebottom of the rabbeted portion, there being a turn-button 25 pivoted tothe upper portion of the frame and capable of being turned to overlapthe adjacent rabbeted portion thereof.

As shown in Fig. 3 of the drawings, it will be noted that the member 1of the hollow box is provided upon its outer side with a flange 1/,extending entirely around the exposure-opening 3 therein, and the maincarrier 9 is provided upon its inner face with upper and lower flanges7), overlappingthe flange (6, so as to form light-tight joints at itspoints. These overlapped flanges must of course have a slidable lit topermit of the horizontal slidable adjustment of the carrier. Uponreference to Fig. 4 it will be noted that the inner face of the carrieris provided with upstanding flanges c, which slidably engage theadjacent face of the back member 1 and are spaced at suitable intervalsfrom the upstanding flange member of said back member, so as to permitof the horizontal slidable movement of the main car rier and at the sameto form light-tight joints.

Bemovably fitted within the rabbeted portion of thevertically-adjustable frame or carrier 18 is a plate-holder support madeup of a relatively large front member 26 of a shape and size to fit therabbeted portion of the carrier and a narrower rear frame member 27,each of which is provided with a central rectangular opening, with theopening of the rear member closed by a ground-glass plate 28. The frontmember 26 is provided with a pcripheral edge groove 29, which extendsentirely around the member and is designed to receive the flange 24 ofthe carrier and the button 25, whereby the plate-holder support isdetachably connected to the carrier and is capable of being inverted.Upon the outer side of the front member 26 are cleats or shoulders 30,between which the ground-glass frame member 27 fits. A pair of bowedsprings 31 have their terminals frictionally bearing against theground-glass frame member and are provided at their middlcs withtransverse shanks 32, which are rigidly secured to the outer faces ofthe respective shoulders, whereby the groundglass frame member isyieldably held against the front member 26 of the plate-holdersupport.An outwardly-directed stud or projection 33 is carried by the respectiveupright edges of the ground-glass frame, and these projections work inseats or grooves ba formed transversely in the inner faces of the cleatsor shoulders 30, thereby permitting of a lateral yielding of theground-glass frame, but preventing endwise displacement thereof from theframe member 26. By reason of this yieldable mounting of theground-glass frame any ordinary form of plate-holder may be readilyinserted between the ground-glass frame and the front frame of theplate-holder support.

As thus far described, it will be understood that in using theattachment a plate-holder is fitted between the members of theplate-holder support. The latter is then fitted to thevertically-adjustable carrier 18, after which thehorizontally-adjustable carrier 9 is set to some predetermined position,and then the vertically-adjustable carrier 18 is set to a predeterminedposition, whereby a predetermined portion of the sensitive'plate in theplate-holder will be properly alined with the lens or exposure-openingof the camera. By raising and lowering the carrier18 and shifting thecarrier 9 from right to left, and vice versa, all of the available spaceon the sensitive plate may be successively alined with the lens of thecamera, thereby to obtain a plurality of exposures upon a single plate.

Tosuccessfully obtain a plurality of exposures upon a single plate, itis of course necessary to restrict the field of action of the rays oflight passing through the lens of the camera and acting upon the plate,and to accomplish this result I provide for varying the size of theexposure-opening of the attachment in the following manner: Themaximumexposureopening is defined by the registered openings 3 and 4 in themembers 1 and 2 of the body of the attachment, and in order that thisopening may be restricted in size I employ within the slight spacebetween the members 1 and 2 a pair of upper and lowervertically-adjustable slides 35 and 36 and a pair of verticallydisposedand horizontally-adjustable slides 37 and 38, of which the oppositeslides are simultaneously adjustable in opposite directions, whereby thesize of the exposure-opening may be readily adjusted. Moreover, bymoving one pair only of the slides the opening may be changed from asquare to an oblong, and

it may also be changed from a horizontallydisposed oblong to avertically-disposed oblong, and vice versa. The two upright slides 37and 38 are connected at their upper ends with individual rack-bars 39and 40, working endwise in registered grooves or guideways 4:1 and 12 inthe inner faces of the members of the body of the attachment, therebeing a pinion 13 disposed between and in mesh with both racks andhaving a stem 14: projected upwardly through the adjacent frame-bar 5and having a finger-piece or head 45 upon its upper end, whereby thepinion may be rotated so as to simultaneously Work the racks back andforth in opposite directions, and. thereby cause the upright slides 37and 38 to simultaneously approach and recede, so as to vary the width ofthe opening. The upper and lower slides 35 and 36 have a similarcontrolling means including rack-bars 16 and 17, working in guideways, apinion 50, in mesh The catch 8 (shown in Figs. 1 and 5 of the drawings)is in the nature of a plate let into the top of the flange 5 andprovided with a beveled front 8, with. its inner edge terminated shortof the back of the recess in which the catch is fitted, so as to presenta shoulder for engagement by any suitable form of hook carried by thetop of the camera-boxsuch, for instance, as indicated by dotted lines inFig. 5--whereby the apparatus may be detachably connected to the'camera.

Having thus described the construction and operation of my invention,what I claim as new, and desire to secure by Letters Patent,

1. A multiple-exposure attachment comprising a back having anexposure-opening, a main carrier having an exposure-opening and mountedupon the back to slide across the exposure-opening thereof, asupplemental carrier having an exposure-opening alined with the openingof the main carrier and mounted upon the main carrier to slide acrossthe same at right angles to the direction of movement of the maincarrier, and a plate-holder support detachably carried by thesupplemental car I rier in alinement with its exposure-opening.

2. A multiple-exposure attachment comprising a back having anexposure-opening and provided with upper and lower horizontal guideways,a main carrier having an exposure-opening and slidably mounted in theguideways of the back, and also provided with upright guideways atopposite sides of its exposure-opening and upon the outer side of thecarrier, means to adjustably interlock the main carrier with the back, asupplemental carrier slidable in the ways of the main carrier andprovided with an exposure-opening, alined with the opening of the maincarrier, means to adjustably interlock the two carriers, and aplate-holder support detachably carried by the supplemental carrier inalinement with its exposure-opening.

3. A multiple-exposure attachment comprising a back having anexposure-opening and provided with a series of sockets, a main carrierhaving an exposure opening and mounted to slide across theexposure-opening of the back, a catch carried by the carrier forcooperation with the series of sockets to adjustably interlock thecarrier with the back, a supplemental carrier having an exposureopeningalined with the opening of the main carrier and mounted to slide acrossthe main carrier at right angles to the direction of the movement. ofsaid main carrier, a series of sockets upon the main carrier disposed atright angles to the series of sockets upon the back, a catch upon thesupplemental carrier for cooperation with the sockets of the maincarrier, and a plate-holder support detachlIO ably carried by thesupplemental carrier in alinement with its exposure-openin i. Amultiple-exposure attachment comprising a back having anexposure-opening, a main carrier having an exposure-opening and mountedto slide across the back, a supplemental carrier having anexposureopening and mounted upon the main carrier to slide at rightangles to the movement of the main carrier, a plate-holder supportdetachably carried by the supplemental carrier in alinement with itsexposure-opening, a projection and socket detachable connection betweenone end of the plate-holder support and the supplemental carrier, and aturn-button connection between the other ends of said members.

5. A multiple-exposure attachment comprising a back having anexposure-opening, a carrier having an exposure opening and mounted toslide across the exposure-opening of .the back, and a plate holdersupport "mounted upon the carrier in alinement with its exposure-openingand including movablyconnected frame members having a seat therebetweenfor the reception of a plate-holder.

6. A multiple-exposure attachment comprising a back having anexposure-opening, a carrier having an exposure-opening mounted to slideacross the exposure-opening of the back, and a plate-holder supportcomprising a front frame member mounted upon the carrier and a rearframe member movably connected to the front framemember and carrying aground glass, said frame members having a seat therebetween for thereception of a plate-holder.

7. A multiple-exposure attachment comprising a back having anexposure-opening, a carrier having an exposure opening and mounted toslide upon the back, and a plateholder support made up of a front framemember mounted upon the carrier and provided with opposite cleats, arear frame member movably seated between the cleats, and springs carriedby the cleats and bearing against the rear frame to yieldably hold thelatter against the front frame.

8. In a multiple-exposure attachment, the combination of a back havingan exposureopening, a carrier having an exposure-opening mounted toslide upon the back, and a plate-holder support comprising a front framemounted upon the carrier and provided with spaced cleatshavingtransverse grooves in their inner faces, a rear frame seated between thecleats-and provided with projections working in the grooves of thecleats, and springs carried by the cleats and bearing against the rearframe to yieldably hold the same against the front frame.

9. In a multiple-exposure attachment, the combination of a back havingan exposureopening, a carrier having a rabbeted exposureopening mountedto slide upon the back, a

to vary the same,

front plate-holder supporting-frame removably fitted in the rabbetededge of the exposure-opening of the carrier and provided with an edgerecess, a catch carried by the carrier and detachably engaging therecess of the frame, spaced cleats carried by the front frame andprovided with transverse grooves in their inner faces, a rear frameseated between the cleats and provided with opposite projections workingin the grooves, and springs carried by the cleats and engaging the rearframe to yieldably hold it against the front frame.

10. A multiple-exposnre attachment comprising a back having anexposure-opening, slides carried by the back at opposite sides of the oiening, and means to simultaneously adjust the slides in oppositedirections to vary the size of the openin 11. A multiple-exposureattachment comprising a back having an exposure-opening, pairs ofoverlapped slides carried by the back and working across the openingtherein, and means to adjust the members of each pair of slidessimultaneously in opposite directions.

12. A multiple-exposure attachment comprising a back having anexposure-opening, a slide carried by the back and movable across theopening, an endwise-movable rack carried by the back and connected tothe slide, a pinion journaled upon the back and meshing with the rack,and means for rotating the pinion to adjust the slide.

13. A multiple-exposure attachment comprising a back having anexposure-opening, slides carried by the back at opposite sides of theopening therein, endwise-movable racks connected to the slides, a pinionjournaled upon the back between the racks and in mesh therewith, andmeans for rotating thepinion.

1%. A multiple-exposure attachment comprising a hollow back having frontand rear exposure-openings, upstanding horizontallymovable slidesmounted within the back at opposite sides of its exposure-opening,vertically-movable slides working within the back at the upper and lowersides of the exposureopening, a pair of horizontally-movable racksmounted within the back and carrying the horizontally-movable slides, apair of vertically-movable racks mounted within the back and connectedto the verticallymovable slides, pinions journaled within the backbetween and in mesh with the members of the respective pairs of racks,and linger-pieces accessible externally of the back and connected to therespective pinions.

15. .111 a multiple-exposure attachment, the combination of a backhaving an exposureopening, slides adjustable across the opening a maincarrier having an mounted to slide across the exposure-opening of theback, means to adjustably interlock the carrier with the back, asupplemental carrier having an exposureexposure-opening LOO opening andmounted to slide upon the main my oWnI have hereto affixecl my signaturein carrier at right angles to the direction of movement of said carrier,means to adjustably interlock the tWo carriers, and a plate-holdersupport mounted upon the supplemental carrier.

In testimony that I claim the foregoing as the presence of twoWitnesses. HARVEY L. BOSTON.

Witnesses: L. B. FULLER,

LOTTIE OTON PALIK.

